theawkwardcellist wrote:2. For the first 1,000 positive integers, how many integers are multiples of 3 or 4?

How many are multiples of 3? (Hint: Divide!) How many are multiples of 4? (Hint: Divide!) Since any multiple of 3*4=12 is a duplicate, you'll need to toss those out. How many are multiples of 12? (Hint: Divide!) What do you get?

theawkwardcellist wrote:3. Between 300 and 800, how many integers are multiples of 5 and 8?

This one works just like the previous one.

theawkwardcellist wrote:4. How many 4 digit numbers between 5,000 and 10,000 are odd numbers?

Where are you stuck in dividing by 2?

theawkwardcellist wrote:5. If k is divisible by 2,3, and 15, which of the following is also divisible by these numbers?(A)k+10(B)k+15(C)k+20(D)k+30(E)k+40

Using the fact that 15=3*5, what can you figure out about these expressions?

theawkwardcellist wrote:6. Which of the following numbers is divisible by the largest prime factor?(A)250(B)260(C)300(D)320(E)400